/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.github.ramerf.wind.core.io;

import io.github.ramerf.wind.core.util.Asserts;
import java.io.*;
import java.net.URI;
import java.net.URL;

/**
 * JBoss VFS based {@link Resource} implementation.
 *
 * <p>As of Spring 4.0, this class supports VFS 3.x on JBoss AS 6+ (package {@code org.jboss.vfs})
 * and is in particular compatible with JBoss AS 7 and WildFly 8+.
 *
 * @author Ales Justin
 * @author Juergen Hoeller
 * @author Costin Leau
 * @author Sam Brannen
 * @since 3.0
 * @see org.jboss.vfs.VirtualFile
 */
public class VfsResource extends AbstractResource {

  private final Object resource;

  /**
   * Create a new {@code VfsResource} wrapping the given resource handle.
   *
   * @param resource a {@code org.jboss.vfs.VirtualFile} instance (untyped in order to avoid a
   *     static dependency on the VFS API)
   */
  public VfsResource(Object resource) {
    Asserts.notNull(resource, "VirtualFile must not be null");
    this.resource = resource;
  }

  @Override
  public InputStream getInputStream() throws IOException {
    return VfsUtils.getInputStream(this.resource);
  }

  @Override
  public boolean exists() {
    return VfsUtils.exists(this.resource);
  }

  @Override
  public boolean isReadable() {
    return VfsUtils.isReadable(this.resource);
  }

  @Override
  public URL getURL() throws IOException {
    try {
      return VfsUtils.getURL(this.resource);
    } catch (Exception ex) {
      throw new IOException("Failed to obtain URL for file " + this.resource, ex);
    }
  }

  @Override
  public URI getURI() throws IOException {
    try {
      return VfsUtils.getURI(this.resource);
    } catch (Exception ex) {
      throw new IOException("Failed to obtain URI for " + this.resource, ex);
    }
  }

  @Override
  public File getFile() throws IOException {
    return VfsUtils.getFile(this.resource);
  }

  @Override
  public long contentLength() throws IOException {
    return VfsUtils.getSize(this.resource);
  }

  @Override
  public long lastModified() throws IOException {
    return VfsUtils.getLastModified(this.resource);
  }

  @Override
  public Resource createRelative(String relativePath) throws IOException {
    if (!relativePath.startsWith(".") && relativePath.contains("/")) {
      try {
        return new VfsResource(VfsUtils.getChild(this.resource, relativePath));
      } catch (IOException ex) {
        // fall back to getRelative
      }
    }

    return new VfsResource(VfsUtils.getRelative(new URL(getURL(), relativePath)));
  }

  @Override
  public String getFilename() {
    return VfsUtils.getName(this.resource);
  }

  @Override
  public String getDescription() {
    return "VFS resource [" + this.resource + "]";
  }

  @Override
  public boolean equals(Object other) {
    return (this == other
        || (other instanceof VfsResource && this.resource.equals(((VfsResource) other).resource)));
  }

  @Override
  public int hashCode() {
    return this.resource.hashCode();
  }
}
